What happens if we kill ender dragon with a charged creeper

Set ender dragon's max health to 1: /data merge entity @e[type=ender_dragon,limit=1] {Attributes:[{Base:1.0d,Name:"generic.maxHealth"}]}

Set ender dragon's health to 1(I didn't use these in the video but then I realized you can directly set dragon's health): /data merge entity @e[type=minecraft:ender_dragon,limit=1] {Health:1.0d} or /data modify entity @e[type=minecraft:ender_dragon,limit=1] Health set value 1

Summon a charged creeper with 1 tick fuse and no AI: /summon minecraft:creeper ~ ~ ~ {powered:1,Fuse:1,NoAI:1}